Black soldermask Multilayer pcb

What is PCB material?

The main material of printed circuit boards (PCB boards) is copper clad plate, and copper clad plate (CLP) is composed of substrate, copper foil and adhesive. The substrate is an insulating layer composed of a polymer synthetic resin and a reinforcing material. The surface of the substrate is covered with a layer of pure copper foil with high conductivity and good weldability, the commonly used thickness is 35 ~ 50/ mA; Copper foil covered on one side of the substrate is called single-sided copper clad plate, both sides of the substrate are covered with copper foil copper clad plate called double-sided copper clad plate; Whether the copper foil can be firmly covered on the substrate, is completed by the adhesive. The thickness of commonly used copper clad plate is 1.0mm, 1.5mm and 2.0mm and the copper thickness is 0.5oz/1oz/1.5oz/2oz/..more heavy copper board.
There are several kinds of commonly used copper clad plates:

FR-1 ─ Phenolic cotton paper, this substrate is commonly known as electric board (more economical than FR-2)
FR-2 ─ phenolic cotton paper,
FR-3 - cotton paper, epoxy resin
FR-4─ Glass cloth, epoxy resin (commonly used in Shenzhen Zhongke circuit glass fiber plate)
FR-5 - Glass cloth, epoxy resin
FR-6 ─ wool glass, polyester
CEM-1 ─ cotton paper, epoxy resin (flame retardant)
CEM-2 ─ cotton paper, epoxy resin (non-flame retardant)
CEM-3 - Glass cloth, epoxy resin
CEM-4 ─ Glass cloth, epoxy resin
CEM-5 ─ Glass cloth, polyester
Ain ─ aluminum nitride
SiC ─ silicon carbide

G-10 -- Glass cloth, epoxy resin